prepare to /TR WD

Author: svgeesus

css-color-4/Overview.bs

@@ -1,10 +1,10 @@
 <pre class=metadata>
 Title: CSS Color Module Level 4
-Status: ED
+Status: WD
 Work Status: Exploring
 ED: https://drafts.csswg.org/css-color/
-TR: http://www.w3.org/TR/css-color-4/
-Previous Version: http://www.w3.org/TR/2016/WD-css-color-4-20160705/
+TR: https://www.w3.org/TR/css-color-4/
+Previous Version: https://www.w3.org/TR/2016/WD-css-color-4-20160705/
 Shortname: css-color
 Group: csswg
 Level: 4